tserver: expose the number of round trips for a scanner

Change-Id: Ia596049c156be5f79e55ac7082488ba1ba462441 Reviewed-on: http://gerrit.cloudera.org:8080/14803 Tested-by: Kudu Jenkins Reviewed-by: Adar Dembo <[email protected]>
wnch · Nov 28, 2019 · 59c5efb · 59c5efb
1 parent 7c5455a
commit 59c5efb
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diff --git a/src/kudu/tserver/tserver_path_handlers.cc b/src/kudu/tserver/tserver_path_handlers.cc
@@ -543,6 +543,7 @@ void ScanToJson(const ScanDescriptor& scan, EasyJson* json) {
   json->Set("requestor", scan.remote_user.username());
 
   json->Set("duration", HumanReadableElapsedTime::ToShortString(duration.ToSeconds()));
+  json->Set("num_round_trips", scan.last_call_seq_id);
   json->Set("time_since_start",
             HumanReadableElapsedTime::ToShortString(time_since_start.ToSeconds()));
 

diff --git a/www/scans.mustache b/www/scans.mustache
@@ -27,6 +27,7 @@ under the License.
       <th title="pseudo-SQL query description">Query</th>
       <th>Requestor</th>
       <th title="amount of time that the scanner was/has been open on the server">Duration</th>
+      <th title="number of round trips">Round trips</th>
       <th title="elapsed time since the scan started">Time since start</th>
       <th title="{{timing_title}}">Timing</th>
       <th>Column Stats</th>
@@ -42,6 +43,7 @@ under the License.
       <td><pre>{{{query}}}</pre></td>
       <td><samp>{{requestor}}</samp></td>
       <td title="{{duration_title}}">{{duration}}</td>
+      <td>{{num_round_trips}}</td>
       <td title="{{time_since_start_title}}">{{time_since_start}}</td>
       <td>real: {{wall_secs}} user: {{user_secs}} sys: {{sys_secs}}</td>